About 10% of the states water is used by Northern California, another 10% is used by Southern California, 80% IS USED BY FARMERS. Now farming is important but farmers have no reason to use less, they are afraid if they use less that they will get less so they use as much as they can. There are lots of farming techniques that would consume less water but they are not used. Since they constitute 80% of water usage even a small improvement would make a major difference in water consumption.